Chinese company screwed up a bridge in the San Fransisco bay area too. Costing almost as much to fix it as it cost to build it.
You are nuts. The cost didn’t soar from $3.5 B to $6B due to repairs. Most of the alleged flaws were due to design and construction problems and are not related to China making the steel or welding the structures in Shanghai.
If you have a source, cite it.